In the method for providing an interactive television broadcast, an area of interest (9) in a television picture (8), corresponding to an object of interest (2) shown in the picture and intended to be associated with interactivity, is determined by means of a marking surface (6) arranged in a particular location relative to the object of interest and differing from the marking surface surroundings on the basis of the radiation from it, the marking surface being detected by a detector (7) sensitive to said radiation.